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/**
* Copyright 2009 Google Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS-IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package net.appjet.oui;
class Synchronizer {
import java.util.concurrent.locks.ReentrantLock;
import java.util.concurrent.ConcurrentHashMap;
private val lockMap = new ConcurrentHashMap[Object, Lock];
private val monitor = new Object {};
private class Lock {
var users = 0;
val impl = new ReentrantLock;
}
def acquire(key: Object) {
val lock = monitor.synchronized {
var lck = lockMap.get(key);
if (lck == null) {
lck = new Lock;
lockMap.put(key, lck);
}
lck.users += 1;
lck;
}
lock.impl.lock();
}
def isHeld(key: Object): Boolean = {
monitor.synchronized {
val lck = lockMap.get(key);
if (lck == null) {
false;
}
else {
lck.impl.isLocked;
}
}
}
def release(key: Object) {
val lock = monitor.synchronized {
var lck = lockMap.get(key);
lck.users -= 1;
if (lck.users == 0) {
lockMap.remove(key);
}
lck;
}
lock.impl.unlock();
}
}
object GlobalSynchronizer extends Synchronizer;
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